To configure netscape to use our email system you need to bring up the prefernces window (found under the edit pulldown menu) :- 
 

Select the "Mail & Groups" Category (i.e. as shown above), and then select the Identity subsection :- 
 

Next select the "Messages" subsection :- 
 

Next select the "Mail Server" subsection :- 
 
 
If you already haven't done so, hit "More Options" :- 
 

Hit the "OK" button on the above window, and then select the "Groups Server" subsection :- 
 

Finally, hit the "OK" button at the bottom of the window, and Thats It! Close down netscape completely and restart it and your changes should be in place. 

If you have any problems with Netscape then Please let me know.